zen cart show customer question at product info page

We have the 'ask a question' button in each product page, customer can click it and send us an email to ask question under the related product. However, we want the question to be showed in the same product's page, and same time the system send an email of the question to us, like the current 'ask a question' is doing. when we reply to customer's question, our reply should be showed in the product page as well, and send customer an email. In the future all the customers are able to see the question and answers. There should be a reminder 'not to post personal information' when customer post the question. see this sample, click Q&A button to see how it works. [login to view URL]